Vertical spindle disc grinder



Jan. 30, 1962 R. E. PRICE VERTICAL SPINDLE DISC GRINDER 5 Sheets-Sheet 1Filed June 17, 1958 m m m5 v m m ATTORNEY Jan. 30, 1962 R. E. PRICE3,013,589

VERTICAL SPINDLE DISC GRINDER Filed June 17, 1958 5 Sheets-Sheet 2INVENTOR E RALP/l' 5. PRICE BY /A 4 ATTORNEY Jan. 30, 1962 R. E. PRICEVERTICAL SPINDLE DISC GRINDER 5 Sheets-Sheet 3 Filed June 17, 1958INVENTOR RALPH :Jwcz

ORNEY Jan. 30, 1962 R. E. PRICE VERTICAL SPINDLE DISC GRINDER 5Sheets-Sheet 4 Filed June 17, 1958 INVENTOR RALPH 5, PRICE BY A 1! flATTORNEY Jan. 30, 1962 R. E. PRICE 3,018,589

VERTICAL SPINDLE DISC GRINDER Filed June 17, 1958 5 Sheets-Sheet 5ATTORNEY 3,@l8,589 Patented Jan. 30, 1962 tine 3,018,589 VERTICAL PINDLEDISC GRINDER Ralph E. Price, Wayneshoro, Pat, assignor to GardnerMachine Company, Beloit, Wis. Filed June 17, 1958, Ser. No. 742,595Claims. (Cl. 51-115) This invention relates to double disc verticalspindle disc grinders.

In disc grinders having opposed rotatable abrasive discs, the discs aregenerally tilted in a direction relative to the path of travel of thework on the work carrier so that the Work passes through a space betweenthe discs which decreases progressively toward the point at which thework emerges from between the discs.

In the past, it has been the practice in conventional disc grinders,particularly horizontal spindle disc grinders, to mount the carrier in aposition dependent upon the construction of the bed. This usuallyresulted in the work on the carrier emerging from between the wheel atapproximately a 45 angle.

In order to cause the faces of the discs to converge in the direction ofthe path of the work, it has been necessary to provide means for tiltingthe disc in both the horizontal and vertical planes.

It is an object of this invention to provide means Whereby the discs maybe properly positioned relative to the path of travel of the work, by asingle angular adjustment. This is accomplished by positioning thecarrier and the disc supporting members so that the path of travel ofthe work as it emerges from the discs is substantially along a line atright angles to the axes about which the discs are tilted.

Another object is to position the discs and their supporting means andthe rotary carrier relative to one another so that when the discs areadjusted angularly, each about a single axis, the path of travel of thework in the carrier as it passes between the center and the periphery ofthe discs is substantially along a line at right angles to the axesabout which said discs are adjusted.

Another object is to provide in a disc grinder having a rotary carrier,a mounting for the abrasive discs by which the discs may be tilted tothe desired position by a single adjustment rather than by a compoundadjustment.

Another object is to provide means for supporting said discs which arearranged relative to said carrier at such an angle that only a singleadjustment is required to tilt the disc to the desired grindingposition.

Another object is to provide means for dressing the discs along a radialpath which is parallel to the axis about which the disc is tilted.

Another object is to provide a carrier mounting which may be oscillatedthrough a slight angle during the grinding operation and through alarger angle to remove the carrier from the path of the dresser.

Another object is to provide means whereby the oscillation of thecarrier is at a minimum in the loading position, that is, the loadingposition is close to or directly over the center of oscillation.

Another object is to provide means to facilitate removal of wornabrasive discs and the replacement of new abrasive discs.

Another object is to provide means for stopping the oscillating movementof the carrier when the carrier is moved out of the path of the dresser,without stopping the device which provides the oscillating movement.

FIGURE 1 is a plan view of a vertical spindle disc grinder having twogrinding heads for effecting successive grinding operations on aworkpiece.

FIGURE 2 is a front elevation of the work carrier drive.

FIGURE 3 is a partial close-up end elevation showing the relationbetween the discs, carrier, work and work guide.

FIGURE 4 is a closeup of the means for rotating and oscillating thecarrier, and for rendering the oscillating means inoperative, andremoving the carrier from the path of the dresser.

FIGURE 5 is a section to the eccentric arrangement which provides theoscillating movement of the carrier.

FIGURE 6 is a right end elevation of the apparatus for removing andreplacing abrasive discs.

FIGURE 7 is a partial end elevation showing the spindle housings andabrasive discs in an exaggerated angular relation, and the dressing toolin its relation to the angular position of the discs.

FIGURE 8 is a sectional elevation of a clamping bolt for holding thespindle housings in a preadjusted position.

FIGURE 9 is a plan view of the dressing mechanism.

Numeral 10 indicates the bed of the machine. 11 is a pedestal forsupporting vertical shaft 12. Horizontal arm 13 is pivotally mounted bymeans of hub member 14 on shaft 12. At the end of arm 13, opposite hubmember 14, is an upwardly extending portion 20 having a shaft 21rotatably mounted therein and a work carrier 22 mounted on the upper endof shaft 21. The lower end of shaft 21 extends into horizontal arm 13and has mounted thereon a worm wheel 25 in operative engagement withworm gear 26 on shaft 27. Worm gear 26 is, in turn, driven by a secondworm wheel 30 which is also mounted on shaft 27 and is driven by wormgear 31 on shaft 32. Shaft 32 has a pulley 33 mounted thereon and isconnected by belt 34 with a double V adjustable pitch-diameter pulley 35on shaft 36. Pulley 35 may be shifted by means of handle 37 to vary thetotal speed ratio of the drive. The second groove on pulley 35 isconnected by belt 41 to motor 46 on hub member 14. Work carrier 22contains a plurality of openings for receiving workpieces, in this case,springs. A guide plate 45 supported beneath work carrier 22 on legs 46prevents workpieces from dropping out of the work carrier 22, whenworkpieces are not between abrasive discs 50 and 51.

Annularly opposed abrasive discs 50 and 51 are mounted on verticalspindles 52 and 53 in spindle housings 54 and 55 which are mounted foradjustment about centers 56 and 57 respectively. Centers 56 and 57 arerecessed on the undersides of spindle housings 54 and 55 which aremounted for adjustment about centers 56 and 57 respectively. Centers 56and 57 are recessed op. the undersides of spindle housing 54 and 55 intowhich are inserted hardened pivot pins 58 and 59 which are mounted inintermediate slide members 60 and 61. Spindle housings 54 and 55 aresecured to intermediate slide members 60 and 61 by means of clampingbolts 64 which pass through abutments 65 on flanges 66 and 69 of spindlehousings 54 and 55 respectively. Members 60 and 61 are slidably mountedon vertical columns 62 and 63, and adjusted or positioned on saidcolumns through suitable connections by hand wheels 67 or motors 68.

Abrasive discs 50 and 51 must be tilted in such a direction that theyapproach closest to each other at the point where the path of the workemerges from between said discs. A radial line through said points wherethe work emerges from between the discs determines the direction of theaxes about which the dies 50 and 51 are tilted. The axes about whichdiscs 50 and 51 are tilted, define the plane which must contain the pathof the dressing tools in order that the faces of discs 50 and 51 may bedressed flat. Ordinarily, this plane will also pass through supportingcolumns 62 and 63. Therefore, in order not to interfere with theoperation of the dresser, the supporting column is set at an angle tothe path of the dresser. In this case, the angle is Spindle housings 54and 55, however, remain in the same position and therefore, intermediatemember 60 must have its surface for receiving the spindle housingperpendicular to the path of the dresser. Briefly, the column and member60 are set at an angle to the path of the dresser. The spindle housingremains the same as though the column had not been changed, and thesurface of the slide member 60 on which the spindle housing is mountedis changed to compensate for its angular displacement.

The faces of members 60 and 61 are formed at such an angle, preferablyat right angles, that spindle housings 54 and 55 may be tilted aboutcenters 56 and 57 to tilt discs 50 and 51 in the direction of the pathof travel of the work so that workpieces passing between said upper andlower discs 50 and 51, will move through a progressively narrower space,the minimum space being at the point where the work emerges from betweendiscs 50 and 51.

Work carrier 22 is subjected to a slight oscillating movement as itrotates during a grinding operation. The center of oscillation is theaxis of shaft 12 in pedestal 11. The oscillatory movement of the carrierat this point is zero and, therefore, it is the logical point forloading and unloading workpieces. The mechanism for providing thisoscillating movement consists of an eccentric 70 mounted on an eccentricportion 28 of shaft 27, which shaft also carries worm gear 26 and wormwheel 30.

Eccentric 70 is connected through yoke member 74 to toggle 71 which, inlocked position, serves as a connecting rod between arm 13 and anchormember 75 in bed It]. Toggle 71 consists of a series of links 72 which,when moved to the dotted line position by means of handle 73, shiftscarrier 22 and arm 13 to the position shown by circle 76, to movecarrier 22 away from the center line of discs 50 and 51 and thus out ofthe path of dresser bar 80 for the discs mounted on column 62. Whenlinks 72 are in the position shown by the dot and dash position, carrier22 is in position shown by circle 77 and out of the path of dresser bar80 for the discs mounted on column 63.

The means for dressing discs 50 and 51 consists of dresser bar 80 towhich is attached a dressing head having oppositely positioned diamonds81 or other dressing tools. Said bar member 80 is slidably supported inbracket 82 attached to column 62. Dressing tools 81 traverse the discsin a path which passes very near to or through the centers of said discsand which are parallel to the axes A and B about which the discs aretilted. For all practical purposes, it can be said that the dressingtools traverse a path which intersects the center of the abrasive discs.If there is a center opening in the discfthe requirement for dressing aflat surface is satisfied so long as the path of the dressing toolpasses through the opening. Where there is no center opening in thedisc, as in the case of the disc disclosed herein, the dresser path mustpass through the center of the disc in order to subject the entireabrasive surface to the action of the dressing tool. This movement ofthe dresser bar 80 is effected by rack 83 and pinion 84 in bracket 82.Pinion 84 may be rotated by any suitable apparatus. Pinion 84 may beoperated either manually or by power. For the purpose of illustration,hand Wheel 85 is shown for this purpose. Hand wheel 85 may be arrangedto drive pinion 84 through a worm gear and worm wheel (not shown).

Provision is made whereby discs 50 and 51 may be replaced with a minimumof effort. Vertical shaft 90 is supported at the upper end by bracket 91attached to column 62 and at the lower end by bracket 92 which isattached to bed 10. Rotatably mounted on shaft 90 are a pair ofvertically spaced arms 95 and 96. When it is desired to remove discs 50and 51, arms 95 and 96 are swung into position to receive said discs.

Spindle housings 54 and 55 are adjusted until disc 50 rests on arm anddisc 51 rests on arm 96. Bolts 49 are then removed, and housings 54 and55 are backed away, leaving the discs supported on the respective arms95 and 96 which can then be swung in the opposite direction to aposition in which they can be more easily picked up by mechanicalhandling apparatus.

I claim:

1. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, and a connection between saideccentric and said base to effect an oscillatory movement of saidcarrier during grinding.

2. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, a connection between saideccentric and said base to effect an oscillatory movement of saidcarrier during grinding, and means to open said connection to swing saidcarrier to a position beyond the range of said eccentric in eitherdirection.

3. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, a connection between saideccentric and said base to effect an oscillatory movement of saidcarrier during grinding, and means to stop said oscillatory movementcomprising means for disabling said connection.

4. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, a connection between said eccentric and said base to effect an oscillatory movement of said carrierduring grinding including a member mounted on the peripheral surface ofsaid eccentric.

5. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a sup porting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, a connection between saideocentric and said base to efiect an oscillatory movement of saidcarrier during grinding comprising a member connecting said eccentricand said base, and means for rendering said connecting member unable tocause said oscillatory movement.

6. 'In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, and a connection between saideccentric and said base to effect an oscillatory movement of saidcarrier during grinding, a motor on said pedestal, and connectionsbetween said motor and said driving member.

7. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, and aneccentric actuated by said driving member, a connection between saideccentric and said base to effect an oscillatory movement of saidcarrier during grinding, and a work loading position for said carrieradjacent said pedestal at which point said oscillatory movement isapproximately zero,

8. In a vertical spindle disc grinder, a base, a tool supporting columnon said base, a slide member mounted for vertical movement on saidcolumn, a spindle housing on said slide member, a spindle rotatablymounted therein, an abrasive disc on said spindle, a rotatable carrierand means for supporting said carrier in operative relation to saidabrasive disc comprising a pedestal on said base, a vertical shaft insaid pedestal, a supporting arm extending horizontally from saidpedestal and having one end oscillatably mounted on said vertical shaft,means for rotatably supporting said carrier at the other end of saidarm, said supporting means being in the form of a driving member, aneccentric actuated by said driving member, and a connection bet-weensaid eccentric and said base to effect an oscillatory movement of saidcarrier during grinding, said connection comprising a multiple linktoggle device and means for opening said toggle to stop said oscillatorymovement.

9. In a vertical disc grinder, a base, a work carrier mounted forhorizontal rotation about a vertical axis, a tool sup-porting column onsaid base, upper and lower slide members mounted for vertical movementon said column toward and from said work carrier, a spindle housing oneach of said slide members, a spindle rotatably mounted in each housing,an abrasive disc centrally on each of said spindles, means for adjustingsaid spindle housings angularly for tilting said discs on parallel axesat an angle to the horizontal plane of said carrier, and a dressing toolmounted for transverse movement between said discs in a path passingthrough the centers of said discs and to one side of said support columnand parallel to the aXes about which said discs are tilted.

10. In a vertical disc grinder, a base, a work carrier mounted forhorizontal rotation about a vertical axis, a tool supporting column onsaid base, upper and lower slide members mounted for vertical movementon said column toward and from said work carrier, a spindle housing oneach of said slide members, a spindle rotatably mounted in each housing,an abrasive disc centrally on each of said spindles, means for adjustingsaid spindle housings angularly on parallel axes for tilting said discsat angle to the horizontal plane of said carrier and a dressing toolmounted for transverse movement between said discs in a path parallel tothe axes about which said discs are tilted.

References Cited in the file of this patent UNITED STATES PATENTS1,575,156 Ecaubert Mar. 2, 1926 2,082,736 Indge June 1, 1957 2,398,463Rumsey Apr. 16, 1946 2,398,628 Dykoski et al Apr. 16, 1946 2,753,667Whitelaw July 10, 1956 27 sq mi p 3, 1 7

